histedit: don't recreate state object

Previously, the histedit state object was being recreated during continue/abort.
This meant that the locks that were held on the original state object were not
available to actions, which meant actions could not release the lock on the
repository (like an 'exec' action would need to do).

This affected our internal extension that added the 'exec' action.

hgext/histedit.py

@@ -599,11 +599,9 b' def _histedit(ui, repo, state, *freeargs'
 
     # rebuild state
     if goal == 'continue':
-        state = histeditstate(repo)
         state.read()
         state = bootstrapcontinue(ui, state, opts)
     elif goal == 'abort':
-        state = histeditstate(repo)
         state.read()
         mapping, tmpnodes, leafs, _ntm = processreplacement(state)
         ui.debug('restore wc to old parent %s\n' % node.short(state.topmost))